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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30bdce7bd0e1ca75b9f556871174d9aff1677951ef1aca5297d81e08e6e41211' 
  AND token = 'XaEnLiI5I2opeAsGQ+xD8ZmhIW8/J3v7+3TFnZwkoYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}